[mirror_ubuntu-artful-kernel.git] / net / ipv6 / xfrm6_policy.c

/*
 * xfrm6_policy.c: based on xfrm4_policy.c
 *
 * Authors:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 * 		IPv6 support
 * 	YOSHIFUJI Hideaki
 * 		Split up af-specific portion
 *
 */

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <net/addrconf.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
#include <net/mip6.h>
#endif

static struct xfrm_policy_afinfo xfrm6_policy_afinfo;

static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
					  xfrm_address_t *saddr,
					  xfrm_address_t *daddr)
{
	struct flowi fl = {};
	struct dst_entry *dst;
	int err;

	memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
	if (saddr)
		memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));

	dst = ip6_route_output(net, NULL, &fl);

	err = dst->error;
	if (dst->error) {
		dst_release(dst);
		dst = ERR_PTR(err);
	}

	return dst;
}

static int xfrm6_get_saddr(struct net *net,
			   xfrm_address_t *saddr, xfrm_address_t *daddr)
{
	struct dst_entry *dst;
	struct net_device *dev;

	dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
	if (IS_ERR(dst))
		return -EHOSTUNREACH;

	dev = ip6_dst_idev(dst)->dev;
	ipv6_dev_get_saddr(dev_net(dev), dev,
			   (struct in6_addr *)&daddr->a6, 0,
			   (struct in6_addr *)&saddr->a6);
	dst_release(dst);
	return 0;
}

static int xfrm6_get_tos(struct flowi *fl)
{
	return 0;
}

static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
			   int nfheader_len)
{
	if (dst->ops->family == AF_INET6) {
		struct rt6_info *rt = (struct rt6_info*)dst;
		if (rt->rt6i_node)
			path->path_cookie = rt->rt6i_node->fn_sernum;
	}

	path->u.rt6.rt6i_nfheader_len = nfheader_len;

	return 0;
}

static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
			  struct flowi *fl)
{
	struct rt6_info *rt = (struct rt6_info*)xdst->route;

	xdst->u.dst.dev = dev;
	dev_hold(dev);

	xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
	if (!xdst->u.rt6.rt6i_idev)
		return -ENODEV;

	xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
	if (rt->rt6i_peer)
		atomic_inc(&rt->rt6i_peer->refcnt);

	/* Sheit... I remember I did this right. Apparently,
	 * it was magically lost, so this code needs audit */
	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
						   RTF_LOCAL);
	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
	xdst->u.rt6.rt6i_node = rt->rt6i_node;
	if (rt->rt6i_node)
		xdst->route_cookie = rt->rt6i_node->fn_sernum;
	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
	xdst->u.rt6.rt6i_src = rt->rt6i_src;

	return 0;
}

static inline void
_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
{
	int onlyproto = 0;
	u16 offset = skb_network_header_len(skb);
	struct ipv6hdr *hdr = ipv6_hdr(skb);
	struct ipv6_opt_hdr *exthdr;
	const unsigned char *nh = skb_network_header(skb);
	u8 nexthdr = nh[IP6CB(skb)->nhoff];

	memset(fl, 0, sizeof(struct flowi));
	fl->mark = skb->mark;

	ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
	ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);

	while (nh + offset + 1 < skb->data ||
	       pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
		nh = skb_network_header(skb);
		exthdr = (struct ipv6_opt_hdr *)(nh + offset);

		switch (nexthdr) {
		case NEXTHDR_FRAGMENT:
			onlyproto = 1;
		case NEXTHDR_ROUTING:
		case NEXTHDR_HOP:
		case NEXTHDR_DEST:
			offset += ipv6_optlen(exthdr);
			nexthdr = exthdr->nexthdr;
			exthdr = (struct ipv6_opt_hdr *)(nh + offset);
			break;

		case IPPROTO_UDP:
		case IPPROTO_UDPLITE:
		case IPPROTO_TCP:
		case IPPROTO_SCTP:
		case IPPROTO_DCCP:
			if (!onlyproto && (nh + offset + 4 < skb->data ||
			     pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
				__be16 *ports = (__be16 *)exthdr;

				fl->fl_ip_sport = ports[!!reverse];
				fl->fl_ip_dport = ports[!reverse];
			}
			fl->proto = nexthdr;
			return;

		case IPPROTO_ICMPV6:
			if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
				u8 *icmp = (u8 *)exthdr;

				fl->fl_icmp_type = icmp[0];
				fl->fl_icmp_code = icmp[1];
			}
			fl->proto = nexthdr;
			return;

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
		case IPPROTO_MH:
			if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
				struct ip6_mh *mh;
				mh = (struct ip6_mh *)exthdr;

				fl->fl_mh_type = mh->ip6mh_type;
			}
			fl->proto = nexthdr;
			return;
#endif

		/* XXX Why are there these headers? */
		case IPPROTO_AH:
		case IPPROTO_ESP:
		case IPPROTO_COMP:
		default:
			fl->fl_ipsec_spi = 0;
			fl->proto = nexthdr;
			return;
		}
	}
}

static inline int xfrm6_garbage_collect(struct dst_ops *ops)
{
	struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);

	xfrm6_policy_afinfo.garbage_collect(net);
	return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
}

static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct dst_entry *path = xdst->route;

	path->ops->update_pmtu(path, mtu);
}

static void xfrm6_dst_destroy(struct dst_entry *dst)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;

	if (likely(xdst->u.rt6.rt6i_idev))
		in6_dev_put(xdst->u.rt6.rt6i_idev);
	if (likely(xdst->u.rt6.rt6i_peer))
		inet_putpeer(xdst->u.rt6.rt6i_peer);
	xfrm_dst_destroy(xdst);
}

static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
			     int unregister)
{
	struct xfrm_dst *xdst;

	if (!unregister)
		return;

	xdst = (struct xfrm_dst *)dst;
	if (xdst->u.rt6.rt6i_idev->dev == dev) {
		struct inet6_dev *loopback_idev =
			in6_dev_get(dev_net(dev)->loopback_dev);
		BUG_ON(!loopback_idev);

		do {
			in6_dev_put(xdst->u.rt6.rt6i_idev);
			xdst->u.rt6.rt6i_idev = loopback_idev;
			in6_dev_hold(loopback_idev);
			xdst = (struct xfrm_dst *)xdst->u.dst.child;
		} while (xdst->u.dst.xfrm);

		__in6_dev_put(loopback_idev);
	}

	xfrm_dst_ifdown(dst, dev);
}

static struct dst_ops xfrm6_dst_ops = {
	.family =		AF_INET6,
	.protocol =		cpu_to_be16(ETH_P_IPV6),
	.gc =			xfrm6_garbage_collect,
	.update_pmtu =		xfrm6_update_pmtu,
	.destroy =		xfrm6_dst_destroy,
	.ifdown =		xfrm6_dst_ifdown,
	.local_out =		__ip6_local_out,
	.gc_thresh =		1024,
};

static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	.family =		AF_INET6,
	.dst_ops =		&xfrm6_dst_ops,
	.dst_lookup =		xfrm6_dst_lookup,
	.get_saddr = 		xfrm6_get_saddr,
	.decode_session =	_decode_session6,
	.get_tos =		xfrm6_get_tos,
	.init_path =		xfrm6_init_path,
	.fill_dst =		xfrm6_fill_dst,
};

static int __init xfrm6_policy_init(void)
{
	return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
}

static void xfrm6_policy_fini(void)
{
	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
}

#ifdef CONFIG_SYSCTL
static struct ctl_table xfrm6_policy_table[] = {
	{
		.procname       = "xfrm6_gc_thresh",
		.data	   	= &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
		.maxlen	 	= sizeof(int),
		.mode	   	= 0644,
		.proc_handler   = proc_dointvec,
	},
	{ }
};

static struct ctl_table_header *sysctl_hdr;
#endif

int __init xfrm6_init(void)
{
	int ret;
	unsigned int gc_thresh;

	/*
	 * We need a good default value for the xfrm6 gc threshold.
	 * In ipv4 we set it to the route hash table size * 8, which
	 * is half the size of the maximaum route cache for ipv4.  It
	 * would be good to do the same thing for v6, except the table is
	 * constructed differently here.  Here each table for a net namespace
	 * can have FIB_TABLE_HASHSZ entries, so lets go with the same
	 * computation that we used for ipv4 here.  Also, lets keep the initial
	 * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
	 * to that as a minimum as well
	 */
	gc_thresh = FIB6_TABLE_HASHSZ * 8;
	xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
	dst_entries_init(&xfrm6_dst_ops);

	ret = xfrm6_policy_init();
	if (ret) {
		dst_entries_destroy(&xfrm6_dst_ops);
		goto out;
	}
	ret = xfrm6_state_init();
	if (ret)
		goto out_policy;

#ifdef CONFIG_SYSCTL
	sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
						xfrm6_policy_table);
#endif
out:
	return ret;
out_policy:
	xfrm6_policy_fini();
	goto out;
}

void xfrm6_fini(void)
{
#ifdef CONFIG_SYSCTL
	if (sysctl_hdr)
		unregister_net_sysctl_table(sysctl_hdr);
#endif
	//xfrm6_input_fini();
	xfrm6_policy_fini();
	xfrm6_state_fini();
	dst_entries_destroy(&xfrm6_dst_ops);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* xfrm6_policy.c: based on xfrm4_policy.c
	3	*
	4	* Authors:
	5	* Mitsuru KANDA @USAGI
	6	* Kazunori MIYAZAWA @USAGI
	7	* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
	8	* IPv6 support
	9	* YOSHIFUJI Hideaki
	10	* Split up af-specific portion
1ab1457c	11	*
1da177e4 LT	12	*/
1da177e4 LT	13
66cdb3ca HX	14	#include <linux/err.h>
66cdb3ca HX	15	#include <linux/kernel.h>
aabc9761 HX	16	#include <linux/netdevice.h>
aabc9761 HX	17	#include <net/addrconf.h>
45ff5a3f	18	#include <net/dst.h>
1da177e4 LT	19	#include <net/xfrm.h>
	20	#include <net/ip.h>
	21	#include <net/ipv6.h>
	22	#include <net/ip6_route.h>
59fbb3a6	23	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a MN	24	#include <net/mip6.h>
2ce4272a MN	25	#endif
1da177e4	26
1da177e4 LT	27	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
1da177e4 LT	28
c5b3cf46 AD	29	static struct dst_entry xfrm6_dst_lookup(struct net net, int tos,
c5b3cf46 AD	30	xfrm_address_t *saddr,
66cdb3ca	31	xfrm_address_t *daddr)
1da177e4	32	{
66cdb3ca HX	33	struct flowi fl = {};
	34	struct dst_entry *dst;
	35	int err;
	36
	37	memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
	38	if (saddr)
	39	memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
	40
c5b3cf46	41	dst = ip6_route_output(net, NULL, &fl);
66cdb3ca HX	42
	43	err = dst->error;
	44	if (dst->error) {
4251320f	45	dst_release(dst);
66cdb3ca HX	46	dst = ERR_PTR(err);
	47	}
	48
	49	return dst;
1da177e4 LT	50	}
1da177e4 LT	51
fbda33b2 AD	52	static int xfrm6_get_saddr(struct net *net,
fbda33b2 AD	53	xfrm_address_t saddr, xfrm_address_t daddr)
a1e59abf	54	{
66cdb3ca	55	struct dst_entry *dst;
191cd582	56	struct net_device *dev;
66cdb3ca	57
fbda33b2	58	dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
66cdb3ca HX	59	if (IS_ERR(dst))
	60	return -EHOSTUNREACH;
	61
191cd582 BH	62	dev = ip6_dst_idev(dst)->dev;
191cd582 BH	63	ipv6_dev_get_saddr(dev_net(dev), dev,
7cbca67c	64	(struct in6_addr *)&daddr->a6, 0,
5e5f3f0f	65	(struct in6_addr *)&saddr->a6);
66cdb3ca HX	66	dst_release(dst);
66cdb3ca HX	67	return 0;
a1e59abf PM	68	}
a1e59abf PM	69
25ee3286	70	static int xfrm6_get_tos(struct flowi *fl)
1da177e4	71	{
25ee3286 HX	72	return 0;
25ee3286 HX	73	}
1da177e4	74
a1b05140 MN	75	static int xfrm6_init_path(struct xfrm_dst path, struct dst_entry dst,
	76	int nfheader_len)
	77	{
	78	if (dst->ops->family == AF_INET6) {
	79	struct rt6_info rt = (struct rt6_info)dst;
	80	if (rt->rt6i_node)
	81	path->path_cookie = rt->rt6i_node->fn_sernum;
	82	}
	83
	84	path->u.rt6.rt6i_nfheader_len = nfheader_len;
	85
	86	return 0;
	87	}
	88
87c1e12b HX	89	static int xfrm6_fill_dst(struct xfrm_dst xdst, struct net_device dev,
87c1e12b HX	90	struct flowi *fl)
25ee3286 HX	91	{
25ee3286 HX	92	struct rt6_info rt = (struct rt6_info)xdst->route;
1da177e4	93
25ee3286 HX	94	xdst->u.dst.dev = dev;
25ee3286 HX	95	dev_hold(dev);
1da177e4	96
bc8e4b95	97	xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
25ee3286 HX	98	if (!xdst->u.rt6.rt6i_idev)
25ee3286 HX	99	return -ENODEV;
1da177e4	100
7cc2edb8 DM	101	xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
	102	if (rt->rt6i_peer)
	103	atomic_inc(&rt->rt6i_peer->refcnt);
	104
25ee3286 HX	105	/* Sheit... I remember I did this right. Apparently,
	106	* it was magically lost, so this code needs audit */
	107	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST \|
	108	RTF_LOCAL);
	109	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
	110	xdst->u.rt6.rt6i_node = rt->rt6i_node;
a1b05140 MN	111	if (rt->rt6i_node)
a1b05140 MN	112	xdst->route_cookie = rt->rt6i_node->fn_sernum;
25ee3286 HX	113	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
	114	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
	115	xdst->u.rt6.rt6i_src = rt->rt6i_src;
1da177e4	116
1da177e4	117	return 0;
1da177e4 LT	118	}
	119
	120	static inline void
d5422efe	121	_decode_session6(struct sk_buff skb, struct flowi fl, int reverse)
1da177e4	122	{
7e3a42a1	123	int onlyproto = 0;
cfe1fc77	124	u16 offset = skb_network_header_len(skb);
0660e03f	125	struct ipv6hdr *hdr = ipv6_hdr(skb);
e3cae904	126	struct ipv6_opt_hdr *exthdr;
d56f90a7 ACM	127	const unsigned char *nh = skb_network_header(skb);
d56f90a7 ACM	128	u8 nexthdr = nh[IP6CB(skb)->nhoff];
1da177e4 LT	129
1da177e4 LT	130	memset(fl, 0, sizeof(struct flowi));
44b451f1 PK	131	fl->mark = skb->mark;
44b451f1 PK	132
d5422efe HX	133	ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
d5422efe HX	134	ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
1da177e4	135
59cae009 WY	136	while (nh + offset + 1 < skb->data \|\|
59cae009 WY	137	pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
d56f90a7 ACM	138	nh = skb_network_header(skb);
d56f90a7 ACM	139	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
e3cae904	140
1da177e4	141	switch (nexthdr) {
7e3a42a1 ND	142	case NEXTHDR_FRAGMENT:
7e3a42a1 ND	143	onlyproto = 1;
1da177e4 LT	144	case NEXTHDR_ROUTING:
	145	case NEXTHDR_HOP:
	146	case NEXTHDR_DEST:
	147	offset += ipv6_optlen(exthdr);
	148	nexthdr = exthdr->nexthdr;
d56f90a7	149	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
1da177e4 LT	150	break;
	151
	152	case IPPROTO_UDP:
ba4e58ec	153	case IPPROTO_UDPLITE:
1da177e4 LT	154	case IPPROTO_TCP:
1da177e4 LT	155	case IPPROTO_SCTP:
9e999993	156	case IPPROTO_DCCP:
59cae009 WY	157	if (!onlyproto && (nh + offset + 4 < skb->data \|\|
59cae009 WY	158	pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
8c689a6e	159	__be16 ports = (__be16 )exthdr;
1da177e4	160
d5422efe HX	161	fl->fl_ip_sport = ports[!!reverse];
d5422efe HX	162	fl->fl_ip_dport = ports[!reverse];
1da177e4 LT	163	}
	164	fl->proto = nexthdr;
	165	return;
	166
	167	case IPPROTO_ICMPV6:
7e3a42a1	168	if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
1da177e4 LT	169	u8 icmp = (u8 )exthdr;
	170
	171	fl->fl_icmp_type = icmp[0];
	172	fl->fl_icmp_code = icmp[1];
	173	}
	174	fl->proto = nexthdr;
	175	return;
	176
59fbb3a6	177	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a	178	case IPPROTO_MH:
7e3a42a1	179	if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
2ce4272a MN	180	struct ip6_mh *mh;
	181	mh = (struct ip6_mh *)exthdr;
	182
	183	fl->fl_mh_type = mh->ip6mh_type;
	184	}
	185	fl->proto = nexthdr;
	186	return;
	187	#endif
	188
1da177e4 LT	189	/* XXX Why are there these headers? */
	190	case IPPROTO_AH:
	191	case IPPROTO_ESP:
	192	case IPPROTO_COMP:
	193	default:
	194	fl->fl_ipsec_spi = 0;
	195	fl->proto = nexthdr;
	196	return;
3ff50b79	197	}
1da177e4 LT	198	}
	199	}
	200
569d3645	201	static inline int xfrm6_garbage_collect(struct dst_ops *ops)
1da177e4	202	{
d7c7544c AD	203	struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
	204
	205	xfrm6_policy_afinfo.garbage_collect(net);
fc66f95c	206	return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
1da177e4 LT	207	}
	208
	209	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	210	{
	211	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	212	struct dst_entry *path = xdst->route;
	213
	214	path->ops->update_pmtu(path, mtu);
	215	}
	216
aabc9761 HX	217	static void xfrm6_dst_destroy(struct dst_entry *dst)
	218	{
	219	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	220
	221	if (likely(xdst->u.rt6.rt6i_idev))
	222	in6_dev_put(xdst->u.rt6.rt6i_idev);
7cc2edb8 DM	223	if (likely(xdst->u.rt6.rt6i_peer))
7cc2edb8 DM	224	inet_putpeer(xdst->u.rt6.rt6i_peer);
aabc9761 HX	225	xfrm_dst_destroy(xdst);
	226	}
	227
	228	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	229	int unregister)
	230	{
	231	struct xfrm_dst *xdst;
	232
	233	if (!unregister)
	234	return;
	235
	236	xdst = (struct xfrm_dst *)dst;
	237	if (xdst->u.rt6.rt6i_idev->dev == dev) {
5a3e55d6	238	struct inet6_dev *loopback_idev =
c346dca1	239	in6_dev_get(dev_net(dev)->loopback_dev);
aabc9761 HX	240	BUG_ON(!loopback_idev);
	241
	242	do {
	243	in6_dev_put(xdst->u.rt6.rt6i_idev);
	244	xdst->u.rt6.rt6i_idev = loopback_idev;
	245	in6_dev_hold(loopback_idev);
	246	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	247	} while (xdst->u.dst.xfrm);
	248
	249	__in6_dev_put(loopback_idev);
	250	}
	251
	252	xfrm_dst_ifdown(dst, dev);
	253	}
	254
1da177e4 LT	255	static struct dst_ops xfrm6_dst_ops = {
1da177e4 LT	256	.family = AF_INET6,
09640e63	257	.protocol = cpu_to_be16(ETH_P_IPV6),
1da177e4 LT	258	.gc = xfrm6_garbage_collect,
1da177e4 LT	259	.update_pmtu = xfrm6_update_pmtu,
aabc9761 HX	260	.destroy = xfrm6_dst_destroy,
aabc9761 HX	261	.ifdown = xfrm6_dst_ifdown,
862b82c6	262	.local_out = __ip6_local_out,
1da177e4	263	.gc_thresh = 1024,
1da177e4 LT	264	};
	265
	266	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	267	.family = AF_INET6,
1da177e4 LT	268	.dst_ops = &xfrm6_dst_ops,
1da177e4 LT	269	.dst_lookup = xfrm6_dst_lookup,
a1e59abf	270	.get_saddr = xfrm6_get_saddr,
1da177e4	271	.decode_session = _decode_session6,
25ee3286	272	.get_tos = xfrm6_get_tos,
a1b05140	273	.init_path = xfrm6_init_path,
25ee3286	274	.fill_dst = xfrm6_fill_dst,
1da177e4 LT	275	};
1da177e4 LT	276
0013caba	277	static int __init xfrm6_policy_init(void)
1da177e4	278	{
0013caba	279	return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
1da177e4 LT	280	}
	281
	282	static void xfrm6_policy_fini(void)
	283	{
	284	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	285	}
	286
db71789c	287	#ifdef CONFIG_SYSCTL
a44a4a00 NH	288	static struct ctl_table xfrm6_policy_table[] = {
a44a4a00 NH	289	{
a44a4a00	290	.procname = "xfrm6_gc_thresh",
d7c7544c	291	.data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
a44a4a00 NH	292	.maxlen = sizeof(int),
	293	.mode = 0644,
	294	.proc_handler = proc_dointvec,
	295	},
	296	{ }
	297	};
	298
	299	static struct ctl_table_header *sysctl_hdr;
db71789c	300	#endif
a44a4a00	301
0013caba	302	int __init xfrm6_init(void)
1da177e4	303	{
0013caba	304	int ret;
a33bc5c1	305	unsigned int gc_thresh;
0013caba	306
a33bc5c1 NH	307	/*
	308	* We need a good default value for the xfrm6 gc threshold.
	309	* In ipv4 we set it to the route hash table size * 8, which
	310	* is half the size of the maximaum route cache for ipv4. It
	311	* would be good to do the same thing for v6, except the table is
	312	* constructed differently here. Here each table for a net namespace
	313	* can have FIB_TABLE_HASHSZ entries, so lets go with the same
	314	* computation that we used for ipv4 here. Also, lets keep the initial
	315	* gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
	316	* to that as a minimum as well
	317	*/
	318	gc_thresh = FIB6_TABLE_HASHSZ * 8;
	319	xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
fc66f95c	320	dst_entries_init(&xfrm6_dst_ops);
d7c7544c AD	321
d7c7544c AD	322	ret = xfrm6_policy_init();
fc66f95c ED	323	if (ret) {
fc66f95c ED	324	dst_entries_destroy(&xfrm6_dst_ops);
d7c7544c	325	goto out;
fc66f95c	326	}
d7c7544c AD	327	ret = xfrm6_state_init();
	328	if (ret)
	329	goto out_policy;
	330
db71789c	331	#ifdef CONFIG_SYSCTL
a44a4a00 NH	332	sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
a44a4a00 NH	333	xfrm6_policy_table);
db71789c	334	#endif
0013caba DL	335	out:
	336	return ret;
	337	out_policy:
	338	xfrm6_policy_fini();
	339	goto out;
1da177e4 LT	340	}
	341
	342	void xfrm6_fini(void)
	343	{
db71789c	344	#ifdef CONFIG_SYSCTL
a44a4a00 NH	345	if (sysctl_hdr)
a44a4a00 NH	346	unregister_net_sysctl_table(sysctl_hdr);
db71789c	347	#endif
1da177e4 LT	348	//xfrm6_input_fini();
	349	xfrm6_policy_fini();
	350	xfrm6_state_fini();
fc66f95c	351	dst_entries_destroy(&xfrm6_dst_ops);
1da177e4	352	}